Power and process plant

ABSTRACT

A power-and-process plant, preferably for producing sulfurous gas, comprising a cyclone furnace, an intermediate unit, and a waste-heat boiler which are disposed along the direction of gas movement, said intermediate unit on its side adjacent to the cyclone furnace comprising water-cooling tubes communicating with at least one section of convective tubes which are disposed within the intermediate unit near the convection surfaces of the waste-heat boiler, and besides, said intermediate unit being included in the water-flow circuit of the waste-head boiler and being enclosed in a split casing.

United States Patent [191 Terentiev et al.

Jan. 7, 1975 POWER AND PROCESS PLANT Inventors:

Filed:

Appl. No.:

US. Cl..... Int. Cl......

Vladimir Dmitrievich Terentiev, ulitsa Chapygina, 5, kv. 34; Efim lsaakovich Dorman, ulitsa Bestuzhevskaya 20, kv. 45; Julia Sergeevna lzmailova, Mytninskaya ulitsa, 15, kv. 25; Viktor Zinovievich Feigin, Moskovsky prospekt, 6, kv. 20; Valentina Alexandrovna Sandovskaya, Sredneokhtinsky prospekt, 43, kv. 2; Galina Jurievna Rudina, Ligovskaya ulitsa, 87, kv. 48; Jury Vasilievich Lastochkin, ulitsa Narodnaya 6, kv. 87; Leonid Matveevich Person, ulitsa 3 lnternatsionala 3, kv. 304; Gennady Markovich Saxonov, Magnitogorskaya ulitsa, 2, kv. 59, all of Leningrad; Viktor Yakovlevich Yakimovich, ulitsa Sheremetieva 30, kv. 19; Vladimir Andreevich Zaitsev, ulitsa Parkovaya 39, kv. 20, both of Belgorod, all of USSR.

Nov. 14, 1972 122/7 R, 122/235 R, 122/494 F22b 31/00 [58] Field of Search 23/261; 122/7 R, 7 A, 7 C, 122/235 R, 336, 235 P. 494

[56] References Cited UNITED STATES PATENTS 2,312,223 2/1943 Titlestud ct al. 122/7 X 2,386,842 10/1945 Crotty l22/D1G. 11

2,754,807 7/1956 Smith 122/7 3,604,400 9/1971 Shurun [22/235 3,608,525 9/1971 Shurun 122/494 Primary Examinerl(enneth W. Sprague Attorney, Agent, or FirmWaters, Roditi, Schwartz & Nissen [57] ABSTRACT A power-and-process plant, preferably for producing sulfurous gas, comprising a cyclone furnace, an intermediate unit, and a waste-heat boiler which are disposed along the direction of gas movement, said intermediate unit on its side adjacent to the cyclone furnace comprising water-cooling tubes communicating with at least one section of convective tubes which are disposed within the intermediate unit near the convection surfaces of the waste-heat boiler, and besides, said intermediate unit being included in the water-flow circuit of the waste-head boiler and being enclosed in a split casing.

2 Claims, 5 Drawing Figures POWER AND PROCESS PLANT The present invention relates to plants for processing raw materials, and more specifically to power-andprocess plants, mainly for producing sulfurous gas.

Known in the art are power-and-process plants comprising a furnace and a waste-heat boiler with convection surfaces, the latter being disposed in succession in the direction of gas movement.

In such power-and-process plants, the convective tubes are sectionalized. Each sectional element is identically disposed relative to the gas flow and acts in similar conditions. Each section has fireside portions which are exposed to higher thermal loads. Ferruginous deposits on the inner surface of the tubes intensely grow with the rise in the thermal load. This is why accumulation of ferruginous deposits is probable in the fireside portions of the tubes, particularly with elevated content of iron in water, eventually resulting in breakdowns.

Besides, said fireside portions are subject to strong abrasive wear. I

With such a disposition of the heating surfaces relative to the gas flow, the probability of damage is equal for all the sections, extensive damage of the tubes being inevitable when the plant is forced.

The repair of such power-and-process plants is done by taking out all the tubes, i.e., by completely dismantling the boiler.

Alsoknown in the art is a radiant-heat water-tube boiler wherein the heating surfaces are located in succession in the direction of gas movement, and the maximum thermal loads are taken by the fireside sections.

However, in this boiler design, the replacement of the fireside sections necessitates just as well the dismantling of the whole boiler.

It is an object of the present invention to eliminate the aforesaid disadvantages of power-and-process plants.

Another object of the invention is to provide a power-and-process plant that would combine high operating reliability with simplified repair and erection work.

These objects are achieved by placing in a powerand-process plant between its furnace and waste-heat boiler an intermediate unit fixed by quick-release joints, in which unit located on its side adjacent to the furnace are water-cooling tubes communicating with at least one section of the convection tubes disposed within the intermediate unit near the convection surfaces of the waste-heat boiler, said intermediate unit being included in the water-flow circuit of the wasteheat boiler.

Advantageously, the intermediate unit should be enclosed in a split casing.

Owing to the intermediate unit being installed at the entry to the boiler, i.e., in the zone of maximum thermal loads, the proposed power-and-process plant features high operating reliability, since the damages caused by ferruginous deposits or abrasive wear occur only in the intermediate unit which can be readily replaced and washed through.

Besides, placing the intermediate unit in a split casing enables removing the unit without breaking the casing.

In the proposed power-and-process plant, the convective tubes alone can be replaced if necessary.

The invention is further explained with reference to anembodiment thereof which is represented in the accompanying drawings wherein:

FIG. 1 shows the design of a power-and-process according to the invention;

FIG. 2 is a sectional view taken along the line lI-II of FIG. 1;

FIG. 3 shows the removed detachable unit as seen in FIG.2;

FIG. 4 is a sectional view taken along the line IV-IV of FIG. 1;

FIG. 5 shows the removed detachable'unit as seenin FIG. 4'. a

The power-and-process plant (FIG.1) comprises a cyclone furnace 1, an intermediate unit 2, and a wasteheat boiler 3, which are successively disposed in the direction of gas movement.

' The cyclone furnace 1 wherein a material, for instance sulfur, is burnt, is made in the form of a cylindrical chamber one end whereof is hermetically closed, a diaphgram 4 being placed at its other end. Located on the lateral surface of the cyclone furnace l are nozzles 5 wherethrough air is supplied to support sulfur combustion.

The surfurous gas produced by the combustion and having a temperature of I,300 to -l,800 C enters the intermediate unit 2 adjoining the cyclone furnace 1.

Located in the intermediate unit 2 on its side adjacent to thefurnace l are water-cooling tubes 6 (FIGS. 1,2,3) communicating with two sections of convective tubes 7 (FIG. 1) are disposed near convection surfaces 8 of the wasteheat boiler 3.

The entire intermediate unit 2 is enclosed in a split casing 9 (FIGS. 2,4) of trapezoidal shape having one removable wall 10.

The water tubes 6 (FIGS. 2,3) and the convective tubes 7 (FIGS. 4,5) disposed on the periphery of the split casing 9 protect the walls of this casing and the plant waste-heat boiler 3 (FIG. against the high temperature effect of the furnace gas.

intermediate unit 2 are arranged in vertical planes, and are interconnected by top and bottom vertical headers 11 which are in turn connected to horizontal headers 12 and 13.

The horizontal headers 12,13 of the intermediate unit that connect together the water-cooling and the convective tubes 6,7 of the unit 2 communicate with a drum 14 of the waste-heat boiler 3 through a system of steam and downtake tubes 15,16, the downtake tubes 16 being spaced apart so as not to hinder the removal of the intermediate unit 2.

The gas cooled in the intermediate unit 2 proceeds to the waste-heat boiler 3 whose convection surfaces consist of sections of convective tubes 17 identical to the sections of the convective tube 7 in the intermediate unit 2, and a superheater 18. The superheater-18 is of conventional type, comprises a number of coiled pipes and is mounted behind the sections of the convective tubes 17 of the waste-heat boiler 3. The gascooled in the waste-heat boiler 3 flows into a flue 19.

When the intermediate unit 2 is to be replaced and repaired the removable wall 10 of the split casing 9 is lifted, and the detachable unit 2 is connected from the steam and downtake tubes 15,16, whereupon it is removed from the split casing 9.

To repair or replace only the sections of the convective tubes 7 in the intermediate unit 2, they are discon- I nected from the horizontal headers 12,13 at the joint with the vertical headers 11.

Since, with regard to the direction of gas movement, the maximum thermal loads are exerted on the first (fireside) sections of the convective tubes 7 and the water-cooling tubes 6, which are accordingly liable to accumulate ferruginous deposits and suffer abrasive wear, the proposed embodiment of a power-andprocess plant with the intermediate unit 2 enables these heat-absorbing surfaces to be readily replaced or washed through.

A power-and-process plant according to the present invention can be employed for processing other raw materials.

What is claimed is:

1. A power-and-process plant, preferably for producing sulfurous gas, comprising: a furnace, an intermediate unit adjoining one side of said furnace and being located in the direction of gas movement; quick-release joints securing said intermediate unit to said furnace, a waste-heat boiler including a predetermined water-flow circuit and having convection surfaces disposed in the direction of gas movement, said boiler adjoining the opposite side of said intermediate unit, said intermediate unit comprising on the side thereof adjacent to said furnace, convective tubes, water-cooling tubes communicating with at least one section of said convective tubes disposed within the intermediate unit proximate said convection surfaces of said waste-heat boiler, said intermediate unit being located in the water-flow circuit of said waste-heat boiler.

2. A power-and-process plant as claimed in claim 1, comprising a split casing enclosing said intermediate unit. 

1. A power-and-process plant, preferably for producing sulfurous gas, comprising: a furnace, an intermediate unit adjoining one side of said furnace and being located in the direction of gas movement; quick-release joints securing said intermediate unit to said furnace, a waste-heat boiler including a predetermined water-flow circuit and having convection surfaces disposed in the direction of gas movement, said boiler adjoining the opposite side of said intermediate unit, said intermediate unit comprising on the side thereof adjacent to said furnace, convective tubes, water-cooling tubes communicating with at least one section of said convective tubes disposed within the intermediate unit proximate said convection surfaces of said waste-heat boiler, said intermediate unit being located in the water-flow circuit of said waste-heat boiler.
 2. A power-and-process plant as claimed in claim 1, comprising a split casing enclosing said intermediate unit. 